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Re: [Xen-devel] [PATCH V3 2/5] Config.mk: update OVMF changeset

On Wed, Oct 30, 2013 at 12:33:50PM +0100, Fabio Fantoni wrote:
> >>For this patches serie:
> >>Tested-by: Fabio Fantoni <fabio.fantoni@xxxxxxx>
> >>
> >>About ovmf:
> >>I don't have uefi domUs ready, so I did a fast test with windows 7
> >>pro 64 bit dvd and starts, spice it works.
> >>The problem found for now is very bad general performance and at the
> >>end of windows installer loading the domU reboots.
> >Oh Windows... :-P
> I know that quality, efficiency, stability and security do not exist
> in the Microsoft vocabulary...
> Unfortunately almost all users for desktop/workstation use windows
> (for now) and even at the time I still use it for work due to some
> programs that only run on windows (and often are made very badly) :(

Don't get me wrong. I'm just saying debugging Windows with no source
code available is beyond my ability. :-)

> >
> >It would be useful to have at least some hypervisor / QEMU logs.
> I found this error on xl dmesg:
> >(XEN) mm.c:620:d0 Could not get page ref for pfn ffffffffffffffff
> I see a recently posted patch about pfn:
> http://lists.xen.org/archives/html/xen-devel/2013-10/msg02028.html
> Can this serie solve the problem and I have to try it or has nothing
> to do with this?

I don't think that patch is useful to fix this at first glance.

AFAICT this is a limitation of Xen's physmap implementation.  I'm still
investigating a proper fix for this -- unfortunately that might
involving modifying Xen's most complicated part so don't hold your

> And this is the error that cause reboot of domU:
> >(XEN) hvm.c:1274:d4 Triple fault on VCPU0 - invoking HVM shutdown
> >action 1.

Windows, right? Could you try Linux?

> I not found any other error or relevant information on logs but I
> attach them if you want see.
> I also tried with Ubuntu 12.04.3, same pfn error on xl dmesg, same
> performance problem (some minutes only for arrive to grub-efi of
> dvd) and after other 10-15 minutes without complete the boot I did a
> destroy.
> Also for that logs on attachments.

Is QMEU busy-looping?

> Despite windows is bad, it seems that problems persist even in the
> test linux except the shutdown with vcpu issue.
> The dom0 used have the installation of this:
> http://lists.xen.org/archives/html/xen-devel/2013-10/msg01111.html
> Except the git branch used (here the hvm-improve.t6) and the qemu:
> git://xenbits.xen.org/staging/qemu-upstream-unstable.git

Oh please don't use staging QEMU. That introduces a new variable which
makes it very hard to identify the genuine problem.


> If you need more informations and/or tests tell me and I'll do/post them.
> About legacy bios support that I mentioned days ago I found this
> document about:
> http://code.coreboot.org/p/seabios/source/tree/master/README.CSM
> Seem that need ovmf change (and probably also on hvmloader) that are
> not able to do.
> Thank for any reply and sorry for my bad english.

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